12th Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology (FLASY 2026)

Contribution List

22. "Heavy-Quark Expansion Meets Experiment: Heavy-Hadron Lifetimes"

Blazenka Melic (Rudjer Boskovic Institute Zagreb)

Parallel talks: 17'+3'

In this talk, I review recent progress in the theoretical description of heavy-hadron lifetimes across different flavor systems, ranging from heavy–light mesons and baryons to doubly heavy hadrons. I discuss how spectator effects, weak annihilation, and Pauli interference contribute to lifetime differences among hadrons with the same heavy quark, and how these effects can be quantified using...

36. An Overview of Current Neutrino Experiments and Their Prospects

Byeongsu Yang (Chonnam National University)

Invited plenary talks: 25'+5'

This talk provides an overview of the current status and future prospects of major neutrino experiments from an experimental perspective. Focusing on representative reactor, accelerator, atmospheric, solar, and astrophysical neutrino experiments, it will introduce their scientific objectives and recent progress.

The talk will also review recent experimental developments related to key...

33. Anomalies in semileptonic rare B decays

Enrico Lunghi (Indiana University)

Invited plenary talks: 25'+5'

Over the past decade, the LHCb and CMS experiments have reported persistent tensions in several branching fractions and angular observables of exclusive rare semileptonic $b$-hadron decays ($b \to s \mu^+\mu^-$). Taken together, these discrepancies exceed the five-standard-deviation level. However, their interpretation remains the subject of active debate, particularly regarding the size and...

9. Boiling down Neutrinos: Cosmological First-Order Phase Transitions in Radiative Mass Models

Francesco Paolo Di Meglio (IFIC (UV-CSIC))

Parallel talks: 17'+3'

Symmetries are the daily bread of modern particle physicists. In a variety of scenarios their breaking is associated with the formation and expansion of bubbles of true vacuum in what is called a first order phase transition. In this context, Electroweak Baryogenesis, a mechanism proposed over 40 years ago, takes advantage of Electroweak symmetry breaking and offers a way to address the baryon...

24. BSM Phenomenologies inspired by singlet-doublet vector-like fermion dark matter

Prof. Narendra Sahu (Indian Institute of Technology Hyderabad)

Invited plenary talks: 25'+5'

Non-refutable evidences from galaxy rotation curves, gravitational lensing and cosmic microwave backgroud (CMB) suggests that there exists non-baryonic matter, called dark matter (DM) in the present Universe. The latest data from satellite borne experiment-PLANCK precisely
measure the DM relic to be 26.8% of the total energy budget of the present Universe. However, the standard model of...

17. Domain walls from discrete flavour symmetries

Ye-Ling Zhou (Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences)

Invited plenary talks: 25'+5'

Discrete flavour symmetries are widely used to address flavour puzzles in quark and lepton sectors. A key cosmological consequence for spontaneous breaking of these symmetries are the formation of domain walls (DWs), 2D topological defects at the cosmic scale. DWs, if they are generated in the radiation era, should collapse before BBN in order to avoid overclosing the Universe. The collapsing...

16. Electromagnetic signatures of axion dark matter halos around primordial black holes

Junghoon Joh (SungKyunKwan University)

Parallel talks: 17'+3'

Dark matter (DM) may accumulate in the gravitational potential of compact astrophysical objects, forming dense bound halos. In particular, if primordial black holes (PBHs) are present, their gravitational field can capture surrounding DM particles and produce a steep density spike in the inner halo region. The resulting compact DM structure provides an environment where microscopic particle...

29. Experimental landscape of quark flavor physics

Youngjoon Kwon (Yonsei University)

Invited plenary talks: 25'+5'

In the Standard Model (SM) of particle physics, fermions exhibit a peculiar hierarchical pattern, most notably in their masses, quark flavor mixing, and charged-current weak interactions. The origin of this flavor structure remains unknown within the SM. Hence, testing these flavor phenomena experimentally provides a vital probe for new physics beyond the SM (BSM) and deeper underlying...

28. Extracting Dark-Matter Mass from Angular Scanning

Daeyeong Jeong (Chungnam National University)

Parallel talks: 17'+3'

Determining the dark-matter mass is important for interpreting signals in direct-detection experiments. However, this can be challenging for low-threshold detectors with limited recoil-energy information. We present a method to estimate the dark-matter mass using directional information in (effectively) two-dimensional detectors. The motion of the Solar System and the Earth through the...

27. Flavor Alignment and Mass Hierarchy

Ernest Ma (UC Riverside)

Invited plenary talks: 25'+5'

Flavor alignment and mass hierarchy in quarks are shown to be achievable in a renormalizable theory using the dark sector, while keeping only the one Higgs doublet of the standard model.

6. Flavor and precision study of a minimally extended scotogenic model

Huchan Lee (Seoul National University of Science and Technology)

Parallel talks: 17'+3'

We investigate the phenomenology of a minimally extended scotogenic model motivated by the observed active neutrino masses, viable dark matter (DM) candidates, and the high-energy behavior of the Standard Model (SM) quartic coupling constant. The neutrino mass generation mechanism is briefly reviewed, covering both normal and inverted mass hierarchies, along with a concise discussion of DM...

4. Flavor Physics of quarks and leptons in non-invertible symmetry

MORIMITSU TANIMOTO (Niigata University)

Invited plenary talks: 25'+5'

We discuss the phenomenological aspects of non-invertible symmetries, in particular, the flavor structure of quarks and leptons. We start with a $Z_M$ discrete symmetry and gauge $Z_2$ so as to obtain a non-invertible symmetry. We derive Yukawa matrices with texture zeros which cannot be realized by a conventional symmetry. We also discuss the SMEFT imposing the non-invertible symmetries and...

13. General Perspective on Boosted Dark Matter from Semi-annihilation

Seongsik Kim (Chungnam National University)

Parallel talks: 17'+3'

We develop a systematic approach for analyzing any dark matter (DM) model that produces boosted dark matter (BDM) through semi-annihilation. We emphasize three points. First, any BDM analysis must be grounded on the correct relic density. Second, any realistic BDM model that aims to be detectable also contains an annihilation channel, which plays a significant role in BDM detection. Finally,...

8. Gravity tidings from domain walls: Flavour hierarchies are making waves

Miguel Levy (University of Basel)

Parallel talks: 17'+3'

Explaining the observed charged fermion mass hierarchies points to flavour symmetries inducing a suppression of the lighter species’ masses. When the symmetries are global, it is expected that such symmetries are broken by gravity via Planck scale suppressed effective operators. The potential of the spontaneous symmetry-breaking “flavon” field, if the symmetry is discrete, then possesses...

3. Impact of first-order phase transition on dark matter relic

Partha Kumar Paul (Indian Institute of Technology Hyderabad)

Parallel talks: 17'+3'

We propose a simple yet testable framework for light fermion dark matter (DM) with mass in the MeV--GeV range, charged under a dark $U(1)_D$ gauge symmetry. Before symmetry breaking, DM annihilates excessively into massless dark gauge bosons, resulting in an under-abundant relic and hence creating severe tension with cosmic microwave background (CMB) and indirect detection constraints. This is...

19. Invariance of the Friedberg-Lee translation as a partial flavor symmetry

Zhi-zhong Xing (Institute of High Energy Physics, Chinese Academy of Sciences)

Invited plenary talks: 25'+5'

A neutrino would be the Goldstone-like (massless) fermion if its field had a translational symmetry, as first pointed out by D.V.Volkov and V.P. Akulov in their pioneering paper about supersymmetry in 1973. But it was R. Friedberg and T.D. Lee who first applied such a working symmetry to constraining the pattern of lepton flavor mixing in 2006. My talk is intended to explain why the...

2. Large CP Violation in the Complex Two-Higgs-Doublet Model: From Electron EDM to Hidden CPV

Soojin Lee (National Tsing Hua University)

Parallel talks: 17'+3'

We perform a comprehensive global analysis of the Complex Two-Higgs-Doublet
Model with softly broken Z₂ symmetry, identifying the intrinsic structure
of parameter regions supporting large CP violation under all current
constraints, including the JILA electron EDM bound. Type-I and Type-II
follow qualitatively distinct pathways: Type-I predicts $|d_e| ≳ 10⁻³¹$ e·cm,
fully testable by...

23. Lepton number densities of Majorana neutrinos at the low energies and implications on neutrino properties

Morozumi

Invited plenary talks: 25'+5'

We study the space-time evolution of the lepton number densities of Majorana neutrinos at low energies. We study it for three neutrinos
cases preparing the initial state with momentum distribution amplitude
localized at the space-time origin. The case that the lightest neutrino is massless and the other case with three massive neutrinos are studied.
These two cases can be distinguished by...

25. Light Dark Matter Sensitivity at the J-PARC Intermediate Water Cherenkov Detector

Seong ha Kim (Chungnam National University / IBS-CUP)

Parallel talks: 17'+3'

Light dark matter (LDM) below the WIMP scale has attracted growing interest, as it can be produced by comparatively low-energy accelerator beams through portal mediators such as the dark photon. A sensitivity study for the Deep Underground Neutrino Experiment (DUNE) near detector demonstrated that an off-axis "PRISM" configuration can effectively separate a dark matter signal from the neutrino...

26. Majorana versus Dirac, Beyond Neutrinoless Double-Beta Decay

Andre de Gouvea (Northwestern University)

Invited plenary talks: 25'+5'

One of the central questions in particle physics is the nature of neutrinos: Are they Majorana or Dirac fermions? I will quickly review the leading experimental campaign to address this question - the search for neutrinoless double-beta decay - and will then discuss other logical possibilities that do not directly involve looking for the violation of lepton number.

34. Mixed wave dark matter and implications in neutrino physics

Yechan Kim (KAIST)

Parallel talks: 17'+3'

Ultralight wave dark matter exhibits oscillations that can modulate particle physics observables. The mixing of two wave dark matter fields can alter this simple oscillation, generating nontrivial temporal structures beyond a monochromatic signal. We discuss two scenarios: potential oscillation with periodic symmetry breaking and restoration, and wave-envelope dark matter with a slow beating...

14. Multimessenger Probes of Heavy Neutrinos

SANJOY MANDAL (Korea Institute for Advanced Study, Seoul, South Korea)

Parallel talks: 17'+3'

Heavy neutrinos provide one of the most compelling windows into physics beyond the Standard Model, offering a common framework for neutrino mass generation, the matter-antimatter asymmetry of the Universe, and potentially dark matter. Their rich phenomenology spans collider, intensity-frontier, and cosmological experiments, making them ideal targets for a multimessenger search strategy.

In...

5. Non-invertible selection rules in string theory and particle physics

Tatsuo Kobayashi (Hokkaido University)

Invited plenary talks: 25'+5'

Group-like symmetries and selection rules have been studied in particle physics. However, string compactifications can lead to not only group-like symmetries, but also "symmetries" without group actions, i.e., non-invertible selection rules. Recently, we have derived several non-invertible selection rules from string theory and applied them to particle physics. See e.g. arXiv:2408.13984,...

7. On the Low Energy Behavior of Dynamical Gauge Couplings

Michael Shamma (Korea Institute for Advanced Study)

We study the low-energy behavior of gauge couplings in the presence of dynamical scalar backgrounds. In weakly coupled, renormalizable four-dimensional theories, gauge invariance prevents tree-level modifications of the gauge kinetic term, so the dependence on scalar background is logarithmic, reflecting renormalization group structure. Large variations thus require large field excursions or...

11. Radiative Fermion Masses and Leptogenesis from a Gauged \(SU(3)_F\) Flavour Symmetry

Gurucharan Mohanta (APCTP Pohang)

Parallel talks: 17'+3'

We discuss a framework based on a local $SU(3)_F$ flavour symmetry in which the observed fermion mass hierarchy and the baryon asymmetry of the Universe arise from the dynamics of flavour symmetry breaking. In the charged-fermion sector, only the third-generation fermions acquire tree-level masses due to a specific choice of field content and gauge charges, while the lighter generations remain...

35. Radiatively-generated top quark flavor-changing neutral currents from dark matter

Adil Jueid (KIAS)

Parallel talks: 17'+3'

We discuss a class of models that simultaneously provide reliable dark-matter candidate and give rise to sizable flavor changing neutral currents (FCNC) of the top/bottom quark at the one-loop order. The models consist of color-charged mediators and $SU(2)_L$ singlet dark matter particles both are odd under a $Z_2$ symmetry. We will discuss both the correlations
between the top FCNC decay...

32. Reviving the Low-Mass Right Handed Neutrino Regime in Minimal Scotogenic Leptogenesis using Majoron Velocity

Arghyajit Datta (Chung-Ang University)

Parallel talks: 17'+3'

In this talk, we will present a possibility of realising successful cogenesis of baryon asymmetry of the Universe, dark matter and neutrino masses within the minimal scotogenic model with low-mass right handed neutrinos (RHN). In the conventional thermal scotogenic leptogenesis setup, there exists a viable parameter space with smaller masses for RHNs as compared to Type-I seesaw case, because...

15. Stringy Constraints on Modular Flavor Models

Takafumi Kai (Kyushu University)

Parallel talks: 17'+3'

We investigate stringy constraints on moduli spaces in modular flavor models by analyzing moduli-dependent threshold corrections in heterotic string vacua. While moduli play a crucial role in determining the flavor structure of fermions predicted by modular flavor models, the parameter space in which their vacuum expectation values are allowed has not been fully explored. In this work, within...

21. Superheavy Dark Matter

Seong Chan Park (Yonsei University)

Invited plenary talks: 25'+5'

The window of dark matter is widely open in the superheavy domain. However, significant model building is requested to make the theory actually work. In this talk, I will discuss some working examples of superheavy dark matter and their potential signals to test the models.

12. Taming lepton portal dark matter by a non-invertible selection rule

Junichiro Kawamura (Kumamoto HS University)

Parallel talks: 17'+3'

In this talk, I will show that a non-invertible selection rule can tame flavor violation induced by the portal Yukawa couplings of dark matter. In ordinary Abelian discrete symmetries without additional spurions, flavor-dependent charge assignments that forbid flavor-violating portal couplings do not allow a realistic PMNS matrix. This tension between the absence of flavor violation in the...

18. The Experimental Landscape of Dark Matter Direct Detection

Dr Hyunsu Lee (IBS)

Invited plenary talks: 25'+5'

The nature of dark matter remains one of the most compelling open problems connecting particle physics, astrophysics, and cosmology. While theoretical models—from WIMPs to sub-GeV and feebly interacting candidates—offer a rich space of possibilities, the direct detection program that tests them through dark matter scattering on terrestrial targets has advanced dramatically over the past...

10. The Goldstone Portal to Charged Lepton Flavour Violation

Antonio Herrero Brocal

Parallel talks: 17'+3'

Neutrino mass models usually involve the breaking of a custodial symmetry related to the masslessness of neutrinos in the Standard Model. Focusing on low-scale seesaws, we will show how, in contrast with scenarios where the symmetry is explicitly broken, the case of spontaneous symmetry breaking introduces crucial distinct directions, mainly through the associated Nambu-Goldstone Boson ($G$)....

20. Two-Pion HBT Signatures of Inhomogeneous Phases in Finite-Density QCD

Yongtae Heo (Hiroshima University, WPI-SKCM²)

Parallel talks: 17'+3'

Spatially inhomogeneous phases may arise transiently in hot and baryon-rich QCD matter and may leave characteristic imprints on two-pion Hanbury Brown–Twiss (HBT) correlations. We investigate such signatures in Au+Au collisions in the RHIC Beam Energy Scan region using the JAM2 transport model. A controlled one-dimensional spatial modulation is imposed on pion emission distributions generated...